package com.nowcoder.community.service;

import com.nowcoder.community.dao.CommentMapper;
import com.nowcoder.community.entity.Comment;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.SensitiveFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.util.HtmlUtils;

import java.util.List;

/**
 * <p>Title: CommentService</p>
 * <p>author 12427</p>
 *
 * @version ver1.0
 * @date 2022/8/17 18:55
 */
@Service
public class CommentService  implements CommunityConstant {

    @Autowired
    private CommentMapper commentMapper ;

    @Autowired
    private SensitiveFilter sensitiveFilter ;

    @Autowired
    private DiscussPostService discussPostService ;

    public List<Comment> findCommentByEntity(int entityType , int entityId ,int offset , int limit){
        return commentMapper.selectCommentsByEntity(entityType,entityId,offset,limit) ;
    }

    public int findCommentCount(int entityType , int entityId){
        return commentMapper.selectCountByEntity(entityType,entityId) ;
    }

    @Transactional(isolation = Isolation.READ_COMMITTED , propagation = Propagation.REQUIRED)
    public int addComment(Comment comment){
        if(comment == null){
            throw new IllegalArgumentException("参数不能为空") ;
        }
        // 添加评论
        comment.setContent(HtmlUtils.htmlEscape(comment.getContent()));
        comment.setContent(sensitiveFilter.filter(comment.getContent()));
        int rows = commentMapper.insertComment(comment) ;

        // 更新帖子的评论数
        if(comment.getEntityType() == ENTITY_TYPE_POST) {
            int count = commentMapper.selectCountByEntity(ENTITY_TYPE_POST , comment.getEntityId());
            discussPostService.updateCommentCount(comment.getEntityId() , count) ;
        }

        return rows ;

    }

    public Comment findCommentById(int id){
        return commentMapper.selectCommentById(id) ;
    }

    public List<Comment> findUserComments(int userId , int offset , int limit){
        return commentMapper.selectCommentsByUser(userId,offset,limit) ;
    }

    public int findUserCount(int userId){
        return commentMapper.selectCountByUser(userId) ;
    }




}
